This is a collection of four libraries which can be used to build
foreign function call interfaces in embedded interpreters.

The four packages are:

    avcall - calling C functions with variable arguments

    vacall - C functions accepting variable argument prototypes

    trampoline - closures as first-class C functions

    callback - closures with variable arguments as first-class C
               functions (a reentrant combination of vacall and 
	       trampoline)
